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Finding the Fourth Proportional to 159.66, 239.64 and 87.42

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Solution

The fourth proportional to 159.66, 239.64 and 87.42 is: 131.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.66 : 239.64 = 87.42 : x
  2. Step 2: Convert to fraction form
    159.66/239.64 = 87.42/x
  3. Step 3: Cross multiply
    159.66x = 239.64 × 87.42
  4. Step 4: Simplify right side
    159.66x = 20,949.33
  5. Step 5: Solve for x
    x = 20,949.33/159.66
  6. Step 6: Final answer
    x = 131.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.